And, another thing: I was just looking through
the source-code...

The media-glow are objects which shouldn't leave a
shadow, right? Why didn't you use no_shadow to avoid
some extra calculation?
Also, the sphere's radius is 8, though the spherical
media inside is just <4.5,2.1,4.5>, so you could've used
only 4.5 (or perhaps 4.6 to be on the safe side), to make
boundary objects smaller and also leave some intense
media-calculations out...
Also, the media uses default sampling/intervals/method,
setting those could've perhaps made the calculations quicker,
but I'm not too sure about that...

If you don't mind, I'll try to use a smaller sphere and render
the next frame that way, if it works, I'll keep it, and otherwise
I'll use your settings again. But using a sphere with media where
the density doesn't fill the entire sphere doesn't make much sense
to me... But perhaps shadowing could interfere with this...

I'll see. 30 lines left for the first image.

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
Email: Tim### [at] gmxde

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